Eva is a expression evaluator developed as a cross platform utility. It is written using ANTLR, gcc. It is created to aid developers to convert between hexa to binary operations easily. It supports all C expressions.

The UI part was initially coded using wxWidgets and now contains - simple command line interface, wxWidgets and Windows specific GUI interface.

The main goal was to develop a small well documented open source calculator. This calculator should allow programmers to easily(small/well documented) extend this tools for their purpose.